На 12 рублей купили два подарка. Сколько может стоить каждый подарок?(умножение и деление еще не проходили)

Выберите правильный вариант: 1. Liz and I are good friends. We know/have known each other for four years. 2. Sarah is very tired. She has been working/is working hard all day. 3. “Where is John?” “He’s upstairs. He does/is doing his homework”. 4. I can’t go to the party on Saturday. I am leaving/have been leaving for Spain on Friday night. 5. Jane has finished/is finishing cleaning her room, and now she is going out with her friends. 6. I didn’t recognise Tom. He looks/is looking so different in a suit. 7. I don’t need to wash my car. Jim washes/has washed it for me already. 8. Ian has been talking/is talking to his boss for an hour now? 9. Claire’s train arrives/has arrived at 3 o’clock. I must go and meet her at the station. 10. “Would you like to borrow this book?” “No, thanks. I have read/have been reading it before”. 11. “Where are you going/do you go?” “To the cinema. Would you like to come with me?” 12. Have you seen my bag? I am searching/have been searching for it all morning. 13. “Is Colin here?” “I don’t know. I haven’t seen/haven’t been seeing him all day”. 14. Sophie is very clever. She is speaking/speaks seven different languages. 15. We are moving/have moved house tomorrow. Everything is packed.

К какому классу органических веществ относится бриллиантовый зелёный (зелёнка)?

Тело массой 2 кг движется равномерно прямолинейно со скоростью 36 км/ч. Выберите правильный ответ: 1. На тело действует постоянная равнодействующая сила, равная 72 Н. 2. Равнодействующая сила равна 0. 3. На тело действует постоянная действующая сила, равная 20 Н. 4. На тело действует постоянная равнодействующая сила, равная 2 Н.